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QNAP QVR Client 5.0.0.13230 Unquoted Service Path

CVE Category Price Severity
CVE-2020-36195 CWE-428 $5,000 High
Author Risk Exploitation Type Date
Mat Powell Critical Local 2021-03-16
CVSS EPSS EPSSP
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L 0.02192 0.50148

CVSS vector description

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2021030099

Below is a copy:

QNAP QVR Client 5.0.0.13230 Unquoted Service Path
# Exploit Title: QNAP QVR Client 5.0.0.13230 - 'QVRService' Unquoted Service Path
# Discovery by: Luis Martinez
# Discovery Date: 2021-03-14
# Vendor Homepage: https://www.qnap.com
# Tested Version: 5.0.0.13230
# Vulnerability Type: Unquoted Service Path
# Tested on OS: Windows 10 Pro x64 es

# Step to discover Unquoted Service Path: 

C:\>wmic service get name, pathname, displayname, startmode | findstr /i "Auto" | findstr /i /v "C:\Windows\\" | findstr /i "QVR" | findstr /i /v """

QVRServiceQVRServiceC:\Program Files (x86)\QNAP\QVR\QVRService.exeAuto


# Service info:

C:\>sc qc "QVRService"
[SC] QueryServiceConfig SUCCESS

SERVICE_NAME: QVRService
        TYPE               : 10  WIN32_OWN_PROCESS
        START_TYPE         : 2   AUTO_START
        ERROR_CONTROL      : 1   NORMAL
        BINARY_PATH_NAME   : C:\Program Files (x86)\QNAP\QVR\QVRService.exe
        LOAD_ORDER_GROUP   :
        TAG                : 0
        DISPLAY_NAME       : QVRService
        DEPENDENCIES       :
        SERVICE_START_NAME : LocalSystem

#Exploit:

A successful attempt would require the local user to be able to insert their code in the system root path undetected by the OS or other security applications where it could potentially be executed during application startup or reboot. If successful, the local user's code would execute with the elevated privileges of the application.


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